WARNING: Wiring con-
nections must be
made in accordance
with all applicable electrical
codes.
WARNING: To prevent
electrical shock, dis-
connect electric power
to system at main fuse or cir-
cuit breaker box until instal-
lation is complete. When a
service switch is installed,
more than one disconnect
switch may be required to
deenergize this device for
servicing.
Zone Sentry Installation and Wiring Diagrams
LED
Motor
Circuit
End Switch
c
w/y
Simplified Internal
Schematic:
Thermostats
Transformer
To “T” Terminals
on Boiler Control
Transformer Relay
T
T
Up to 12 Valves per
40va Transformer
L1 (Hot)
L2
24 v
End Switch
Rh/Rc
w/y
Rh/Rc
w/y
Rh/Rc
w/y
w/y
c
End Switch
w/y
c
End Switch
w/y
c
Typical Zone Sentry Zone Valve Wiring:
NOTE 1: Some power robbing thermostats require the use of a resistor (always use the resistor provid-
ed by the thermostat manufacturer with the Zone Sentry). Consult the thermostat instructions for the
resistor installation.
NOTE 2: The plug-in quick connects can be disconnected from the valve actuator for ease of wiring.
Insert the corresponding wire into the quick connects and tighten by turning the screw.
CAUTION: Do not jumper the power/motor (24 VAC) connection terminals, even temporarily. This
may cause damage to the thermostat’s heat anticipator or to the transformer.
Typical Installations for 3-way Valves Normally Closed to the Load
Typical Installations for 3-way Valves Normally Open to the Load
LOAD
LOAD
LOAD
LOAD
SUPPLY
SUPPLY
SUPPLY
SUPPLY
SUPPLY
SUPPLY
SUPPLY
SUPPLY
RETURN
RETURN
RETURN
RETURN
FLOW ON
NO CALL
FLOW ON
NO CALL
FLOW ON
NO CALL
FLOW ON
NO CALL
FLOW ON
CALL
FLOW ON
CALL
FLOW ON
CALL
FLOW ON
CALL
ELECTRICAL
CONNECTION
ELECTRICAL
CONNECTION
ELECTRICAL
CONNECTION
ELECTRICAL
CONNECTION
NOTE for 3-way: Actuator’s power connections must be mounted over the port requiring flow when
power is applied. The valve should always be installed so that the unpowered port is the one with the
highest percentage of time with flow.
